EMPLOYEE STOCK BASED COMPENSATION PLANS (Details) (USD $)	12 Months Ended				12 Months Ended		12 Months Ended										0 Months Ended					12 Months Ended				0 Months Ended						0 Months Ended				12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010	Mar. 31, 2012 Range 65.00 to 65.70 [Member]	Mar. 31, 2012 Range 65.70 [Member]	Mar. 31, 2013 Stock Options [Member]	Mar. 31, 2012 Stock Options [Member]	Mar. 31, 2011 Stock Options [Member]	Mar. 31, 2013 Restricted Stock [Member]	Mar. 31, 2012 Restricted Stock [Member]	Mar. 31, 2011 Restricted Stock [Member]	Mar. 31, 2013 Restricted Stock [Member] Key employees [Member]	Mar. 31, 2013 Phantom Stock Awards [Member]	Mar. 31, 2013 1999 Plan [Member] Range 76.74 to 152.98 [Member]	Mar. 31, 2012 1999 Plan [Member] Range 76.74 to 152.98 [Member]	Jul. 30, 2008 1999 Plan [Member] Stock Options [Member]	Jul. 21, 2008 1999 Plan [Member] Stock Options [Member]	Jul. 16, 2007 1999 Plan [Member] Stock Options [Member]	Jul. 17, 2006 1999 Plan [Member] Stock Options [Member]	May 15, 2006 1999 Plan [Member] Stock Options [Member]	Mar. 31, 2013 1999 Plan [Member] Stock Options [Member]	Mar. 31, 2012 1999 Plan [Member] Stock Options [Member]	Mar. 31, 2013 1999 Plan [Member] Stock Options [Member] Minimum [Member] Installment	Mar. 31, 2013 1999 Plan [Member] Stock Options [Member] Maximum [Member] Installment	Jul. 18, 2011 2009 Plan [Member]	Jul. 19, 2010 2009 Plan [Member]	Mar. 22, 2010 2009 Plan [Member]	Oct. 19, 2009 2009 Plan [Member]	Mar. 31, 2013 2009 Plan [Member] Range 76.74 to 152.98 [Member]	Mar. 31, 2012 2009 Plan [Member] Range 76.74 to 152.98 [Member]	Jul. 18, 2011 2009 Plan [Member] Stock Options [Member]	Jul. 19, 2010 2009 Plan [Member] Stock Options [Member]	Mar. 22, 2010 2009 Plan [Member] Stock Options [Member]	Oct. 19, 2009 2009 Plan [Member] Stock Options [Member]	Mar. 31, 2013 2009 Plan [Member] Stock Options [Member] Installment	Mar. 31, 2012 2009 Plan [Member] Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)										47,000																										140,000
Expiration period from date of grant																						10 years														10 years
Number of annual installments on exercise of awards																								5	10											5
Options available for grant (in shares)										38,350	37,350																									70,250
Compensation expense							$ 405,945	$ 1,009,922	$ 957,168	$ 109,083	$ 40,377	$ 0
Unrecognized compensation cost							897,537
Weighted average service period							1 year 2 months 12 days			4 years 1 month 6 days
Options fair value assumptions [Abstract]
Weighted Average Fair Value (in dollars per share)																	$ 29.93	$ 27.35	$ 41.78	$ 33.05	$ 31.28											$ 33.07	$ 28.58	$ 32.56	$ 25.36
Expected Dividend Yield (in hundredths)																	0.62%	0.67%	0.39%	0.61%	0.64%											0.83%	0.91%	0.84%	1.04%
Risk-Free Interest Rate (in hundredths)																	3.36%	3.41%	4.95%	5.04%	5.08%											1.45%	1.73%	2.43%	2.36%
Expected Volatility (in hundredths)																	20.20%	20.20%	19.90%	21.20%	21.10%											40.00%	37.50%	37.80%	37.60%
Expected Life (in years)																	5 years	5 years	5 years	7 years	7 years											5 years	5 years	5 years	5 years
Stock options [Roll Forward]
Balance at beginning of period (in shares)														26,000								95,000	96,500													83,750	73,750
Granted (in shares)														4,050								0	0			10,000	15,000	20,000	38,750							0	10,000
Exercised (in shares)																						(19,105)	(1,500)													(27,023)	0
Vested (in shares)														0
Canceled/forfeited or expired (in shares)														(7,500)								(14,395)	0													(14,000)	0
Balance at end of period (in shares)							104,227							22,550								61,500	95,000													42,727	83,750
Weighted Average Exercise Price [Roll Forward]
Beginning of Period (in dollars per share)														$ 146.95								$ 113.63	$ 114.78													$ 85.75	$ 84.24
Granted (in dollars per share)														$ 158.65								$ 0	$ 0			$ 96.92	$ 88.20	$ 95.79	$ 76.74							$ 0	$ 96.92
Exercised (in dollars per share)																						$ 95.33	$ 65.70													$ 79.82	$ 0
Vested (in dollars per share)														$ 0
Canceled/forfeited or expired (in dollars per share)														$ 146.95								$ 111.14	$ 0													$ 85.78	$ 0
Balance at end of period (in dollars per share)							$ 114.58							$ 149.05								$ 132.00	$ 113.63													$ 89.49	$ 85.75
Weighted average remaining contractual term, outstanding							1 year 2 months 12 days	2 years 6 months
Weighted average remaining contractual term, exercisable							8 months 12 days
Aggregate intrinsic value, outstanding							3,310,129
Aggregate intrinsic value, exercisable							2,169,482
Exercise price range, lower range limit (in dollars per share)	$ 76.74	$ 76.74			$ 65.00
Exercise price range, upper range limit (in dollars per share)	$ 152.98	$ 152.98			$ 65.70
Options exercisable (in shares)	63,227	87,590		54,325	11,400	1,500									63,227	87,590														63,227	87,590
Weighted average exercise price, Exercisable (in dollars per share)	$ 128.47	$ 112.25		$ 115.57											$ 128.47	$ 112.25														$ 128.47	$ 112.25
New shares issued for cash		98,550	745,200
Stock Awards [Abstract]
Vesting period										5 years
Restricted stock granted (in shares)										2,000			9,650
Restricted stock vested during the year (in shares)										(1,330)
Restricted stock available for issuance beginning balance (in shares)										37,350
Restricted stock granted during the year (in shares)										(2,000)			(9,650)
Restricted stock forfeited during the year (in shares)										3,000
Restricted stock available for issuance ending balance (in shares)										38,350	37,350																									70,250
Unrecognized compensation cost										615,200
Summary of Share Activity [Rollforward]
Unvested at beginning of period (in shares)										9,650
Granted (in shares)										2,000
Vested (in shares)										(1,330)
Forfeited or expired (in shares)										(3,000)
Unvested at end of period (in shares)										7,320	9,650
Weighted Average Fair Value [Rollforward]
Unvested at beginning of period (in dollars per share)										$ 83.60
Granted (in dollars per share)										$ 104.34
Vested (in dollars per share)										$ 83.60
Forfeited or expired (in dollars per share)										$ 83.60
Unvested at end of period (in dollars per share)										$ 89.27	$ 83.60
Weighted Average Remaining Vesting Term (in Years) [Abstract]
Weighted Average Remaining Vesting Term Unvested Beginning										3 years 9 months 18 days				3 years 9 months 18 days
Weighted Average Remaining Vesting Term, granted										4 years 9 months 18 days				4 years 9 months 18 days
Weighted Average Remaining Vesting Term, vested														0 years
Weighted Average Remaining Vesting Term Forfeited or Expired														0 years
Weighted Average Remaining Vesting Term, Unvested Ending										3 years 9 months 18 days				3 years 9 months 18 days
Estimated deferred compensation liability														$ 693,401